 |
| ||
| |||
|
| Math Central | Quandaries & Queries |
|
Question from Jacob, a student: A valid UPC number , ABABABABAB- C must end in a 2 after using the rule: 3A +B+3A+B+3A+B+3A+B+3A+B+C=##2. What would term C need to be in order to make the following UPC valid? 2741825293-C |
Hi Jacob,
Apply the rule to the first 10 digits of the UPC which are 2741825293. Thus you get
\[3 \times 2 + 7 + 3 \times 4 \mbox{ and so on.}\]
What digit $C$ do you need to add to the result to obtain a three digit number with units digit 2?
Harley
| ||
| ||
| ||
 |
 |
|
Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.